Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246..175l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 1, June 1991, p. 175-179. Research supported by SERC.
Astronomy and Astrophysics
Astrophysics
32
O Stars, Shell Stars, Stellar Composition, Stellar Evolution, Stellar Spectra, Abundance, Helium, Metallicity, Stellar Atmospheres, Stellar Rotation, Ultraviolet Radiation
Scientific paper
Classical non-LTE model atmosphere techniques are used to analyze a high signal-to-noise, high-resolution spectrum of HD 93521 in the wavelength region 4070-4510 A. Abundances of nitrogen, oxygen, magnesium, and silicon were all found to be approximately solar. Attempts to fit the UV continuum flux with model fluxes imply a UV deficiency relative to the V-band. The present results are consistent with HD 93521 being a Population I late O-type shell star. It is inferred that the overabundance of helium is the result of turbulent diffusion, induced by the star's large rotational velocity, mixing CNO-cycled material into its atmosphere. It is suggested that HD 93521 is evolving on a track intermediate between homogeneous and normal evolutionary tracks and may exhibit moderate changes in CNO surface abundances which are masked by the star's large projected rotational velocity of 400 km/s.
Dufton Philip L.
Holmgren D. E.
Keenan Francis P.
Lennon Daniel J.
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